Assume you want the pump to come on when the water is high.
I am talking about 2 switches N/O make on water rise.
you have a relay with a second N/O contact (might be a side switch on a big contactor)
Wire the upper water switch to the coil
Also wire the lower water switch to the coil but in series with the N/O side switch.
Water rises, bottom switch makes, nothing happens yet because contactor N/O is still open. Then upper switch makes, that makes the contactor. N/O switch is made. Water starts to fall. Top switch opens but the contactor is still held up by lower switch through the N/O. When lower switch opens the contactor drops out.
